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Gravityloss
on Aug 19, 2018
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Stacking concrete blocks is a surprisingly efficie...
There was a project to carve a huge cylinder, kilometers wide, out of bedrock and raise and lower it with hydraulics. You could keep whatever's on top mostly intact. I don't know what's the latest status.
markvdb
on Aug 19, 2018
[–]
http://www.authorstream.com/Presentation/heindl-958931-hydra...
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